Edbey K.,University of Garyounis | Moran G.,University of New South Wales | Willett G.,University of New South Wales International Journal of ChemTech Research | Year: 2010

The analytical potential of the complexation of flavone with Zn(II), Cd(II), and Co(II) was investigated by positive-ion electrospray ionization Fourier transform ion cyclotron resonance (ESI-FTICR) mass spectrometry. The binding selectivity of the flavone with three different divalent metal ions Cd(II), Co(II), and Zn(II), reveals that the flavone favors binding to Zn(II) over Co(II) and Cd(II) and that the order of relative binding affinity is Zn(II) > Co(II) > Cd(II). This is can be attributed to the polarizability, or relative hardness of the metal ions. The counter-ion binding selectivities measured by FTICR mass spectrometry of flavone with ZnC12, Zn(NO 3) 2, and Zn(C1O4)2 show that the order of selectivity for the complexation of flavone metal complex with the counter-ions is C1O4- > C1- > NO 3-. The exact reason for such selectivity order is not known, so that further experiments and calculation are required to understand these effects of counter-ion selectivities.
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